682 FILICES. 



ft Sori flabellate : no midrib ; leaf coriaceous. 



197. A. dimidiatmn, Sw. Leaf pinnatisect, coriaceous ; segments rhomboid or rhom- 

 boid-oblong, irregularly serrate at the upper margin, incised or unequally 2-fld at the acu- 

 minate summit, obliquely cuneate at the dimidiate base, lowest conform : rhachis flattish, 

 convex beneath : no midrib : veins flabellate, narrowly dichotomous : petiole blackish ; 

 sori linear, radiating, unequal in length and distance from the base. — Kze. Farnler. t. 48. 

 Metten. Fit. Lips. t. 13./. 22.— A. zainiifolium, Kze.— Segments 3"-l " long, l"-6"' broad; 

 longest sori 8"'-12'" long, irregular in their position toward the indusium. — Hab. Ja- 

 maica!, Mac/., Wiles, Shepherd; [Cuba! to Peru!; trop. Africa!]. 



tff Sori close to the midrib below ; leaf coriaceous-chartaceous. 



198. A. erosum, Metten., Hook, (non L.). Leaf pinnatisect, coriaceous : segments 

 trapezoid-lanceolate or lanceolate-linear, acuminate, irregularly serrate or inciso-serrate 

 above the obliquely cuneate base, lowest conform : rhachis channelled, convex beneath : veins 

 narrowly dichotomous or forked, nearly excurrent : petiole pale or pale brown; sori linear, 

 extending from near the midrib to the serratures. — Hook. Spec. t. 198. — A. salicifolium, L. 

 (Plum. Fil. t. 60), is probably this species, but it is useless to restore old names in Jsple- 

 nium, as absolute certainty is not to be attained, and often allied species were formerly not 

 distinguished. A. falcatum, Sw. sec. Kze. {non Lam.). — Segments 2"-4" long, 7"' - 3 

 broad above the base ; sori 6"'-9'" long. — Hab. Jamaica !, Pd., Wils., March, in mountain 

 woods ; [Cuba ! Haiti]. 



199. A. Serra, Langsd., Fisch. Leaf pinnatisect, chartaceous : segments long, lanceo- 

 late-acuminate or oblong-lanceolate, sharply and unequally serrate above the cuneate or up- 

 ward produced, often petiolulated base, lowest conform : rhachis channelled, convex beneath : 

 veins narrowly dichotomous, excurrent : petiole brown ; sori oblong, approximate to the 

 midrib, and mostly subparallel to it, much distant from the margin. — A. zamiifolium, Pi- 

 Carib. (exclus. sgn.) : the broad-leaved A. Serra, 0. Imrayanum, Hook. ! A. erosum, <S«0.. 

 —Segments 4"-6"(-10") long, 8"'-20"' broad; sori 4"'-6"'(-12'") long.— Hab. Jamaica!, 

 Pd., Wils. ; Dominica !, Imr. ; [Cuba to French islands ! ; Venezuela ! to Brazil ! ; trop. 

 Africa !]. 



200. A. auritum, Sw. Leaf pinnatisect, chartaceous: segments lanceolate-linear or 

 obloug-lanceolate, usually acuminate, upwards auricled at the cuneate base, inferior mostly 

 pinnatipartite at the auricle, or with the divisions decrescent toward the serrulate apex, 

 lowest conform : rhachis margined above or to the base : veins forked, inferior dichotomous, 

 branches terminated near the margin : petiole pale ; sori oblong, approximate to the midrib 

 below, oblique, distant from the margin. — SI. t. 33. /. 2. Schk. Crypt, t. 130. b. sup. 

 dextr.—k. erosum, L. (ex. ic. SI.).— Variable ; segments l"-3" long, 2"'-6'" broad above 

 the auricle ; sori usually 1 V"-2"' long, often confluent. 



a. Segments divided only at or near the auricle, or serrulate only. — A. umbrosum, Kaulf. 



j8. recognitum, Kze. Segments pinnatipartite-pmnatifid. — Plum. Fil. t. 46. Metten. 

 Fil. Lips. t. 9.f. 5. 6. — A. dispermum, Kze. 



Hab. Jamaica !, Pd., Pancr., on trees (o) ; Dominica !, Sieb., Imr. (a, 0) ; [Cuba ! to 

 French islands! ; Mexico ! to Brazil ! ; Galapagos ! ; East Indies !]. 



201. A. bissectum, Sw. Leaf pinnatisect, chartaceous : segments lanceolate-linear, 

 narrowly acuminate, obliquely cuneate at the base, pinnatifid, lowest shorter : inferior lobes 

 inciso-2-dentate : rhachis slightly channelled, convex beneath : veins forked, lowest dichoto- 

 mous, branches much produced into the teeth : petiole purplish-brown ; sori linear- oblong, 

 approximate to the midrib, subparallel to it, much distant from the margin. — Hook. Spec 

 t. 192.— Segments 2"-3" long, 3"'-6'" broad at the base, dark-green ; sori 14"'-2"' long. 

 — Hab. Jamaica !, Mac/., Wiles ; [Cuba ! to Venezuela]. 



202. A. furcatnm, Thunb. Leaf pinnatisect, coriaceous, often hairy beneath : seg- 

 ments pinnatipartite, lowest conform : special segments cuneate-rhomboid or linear, incised 

 or dentate at the summit (—pinnatifid) : rhachis villous-paleaceous, narrowly channelled, 

 convex beneath : veins flabellate, narrowly forked or dichotomous, nearly excurrent : petiole 

 dark-brown ; sori linear, approximate-confluent, subparallel or little radiating, innermost 

 lining the inconspicuous midrib. — Hook. Grev. Ic. t. 189. — A. preemorsum, Sw. : the oldest 



